Chapter 1
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I
NTRODUCTION
HPT401BT is the up-to-date unsurpassed 1W UHF radio transceiver with USB and Bluetooth® capacity,
and internal rechargeable Li-Ion batteries. The HPT401BT radio transceiver provides a high-speed point-
to-point and point-to-multipoint wireless data transfer at up to 38.4 kbps. HPT401BT firmware supports
user selectable modulation techniques (GMSK, 4FSK, DBPSK, DQPSK, D8PSK, or D16QAM), which
allows the user to achieve the highest data speed for a given range. It also includes a selectable error
correction, which improves the functioning of the radio modem under interference.
The built-in software tools provide the wireless link testing, unit’s status and error statistics monitoring as
well as unit’s settings change over the air. The firmware of the HPT401BT radio modem resides in a flash
memory. The updating of the radio modem programs is entirely software-based. The flash memory is re-
programmable through an RS-232 interface, USB, or Bluetooth.
Figure 1. HPT401BT without battery and HPT401BT with battery
The unit’s user settings can be changed through the built-in Command Line interface (CLI) or through the
supporting software ModemVU - Windows based Unit Configuration and Maintenance Software
Application running on a IBM PC compatible computer and connecting to the device over RS-232
interface or USB.
The diagnostic feature of the system provides the information to monitor and maintain user’s
communications link. The output transmit power, received signal strength (RSSI) and data decode
performance are transmitted online without application interruption.
The product is designed for maximum performance and reliability even in the harshest environments.
